Issue #1158 - removed unnecessary definitions and #ifdef/#else/#endif sections

adblockplus.gyp

 {
   'includes': ['defaults.gypi'],
 
   'variables': {
     'build_type%': 'devbuild',
     'build_version%': '',
   },
 
   'target_defaults': {
     'conditions': [
@@ skipping 132 matching lines @@
       'src/plugin/SinkPolicy.inl',
     ],
     'include_dirs': [
       '$(WindowsSDK_IncludePath)',
       '$(VCInstallDir)atlmfc/include',
       '$(WINDDKDIR)/inc/atl71',
     ],
     # See "Adding Visual Style Support to an Extension, Plug-in, MMC Snap-in or a DLL
     # That Is Brought into a Process" on the link here:
     # http://msdn.microsoft.com/en-us/library/windows/desktop/bb773175%28v=vs.85%29.aspx#using_manifests
-    'defines': ['PRODUCT_ADBLOCKPLUS', 'ISOLATION_AWARE_ENABLED'],
+    'defines': ['ISOLATION_AWARE_ENABLED'],
     'libraries': [
       '-lwinhttp',
       '-lshell32',
       '-lComctl32',
       '-lGdi32',
     ],
     'configurations': {
       # 'libraries' is not allowed under 'configurations' :-(
       'Debug': {
         'msvs_settings': {
@@ skipping 48 matching lines @@
       'libraries': ['-ladvapi32', '-lshell32', '-lole32'],
     },
     'msvs_settings': {
       'VCLinkerTool': {
         'SubSystem': '1',   # Console
         'EntryPointSymbol': 'mainCRTStartup',
       },
     },
   }]
 }